Multiple-metal-grinder.



Patented Oct. 24,. I899.

C. E. BLECHSCHMIDT.

MULTIPLE METAL GRINDER.

(Application filed July 17, 1899.)

(N0 Model.)

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NIT ATES CHARLES E. BLECHSCHMIDT, OF BELLEVUE, KENTUCKY, ASSIGNOR TO THEVICTOR SAFE AND LOCK COMPANY, OF CINCINNATI, OHIO.

MULTIPLE METAL-GRINDER.

SPECIFICATION forming part of Letters Patent No. 635,292, dated October24, 1899.

Application filed July 17, 1899.

To all whom it may concern.-

Be it known that I, CHARLES E. BLEoH- SCHMIDT, a citizen of the UnitedStates, residing at Bellevue, in the county of Campbell and State ofKentucky, have invented certain new and useful Improvements in MultipleMetal-Grinders; and I do hereby declare the following to be a full,clear, and exact description of the invention, reference being had tothe accompanying drawings, which form a part of this specification.

My invention comprises a machinein which either one or all of a set ofrotating grinders may be readily brought into action for the purpose ofmaking a very accurate fit of circular jointssuch, for example, as theseatings of stepped screw-doors for safe-frames, &c.. the details ofsaid machine, its peculiar operation, and the advantages resulting fromits use being hereinafter more fully described.

In the accompanying drawings, Figure 1 is a front elevation of amultiple metal-grinder embodying my invention, a pair of sliding headsbeing applied thereto and the central portion of the main frame beingbroken away to indicate that it can be long enough to carry any desirednumber of such shiftable devices. Fig. 2 is an' enlarged verticalsection of the machine, taken in the plane of a grindingshaft of one ofsaid heads, a stepped door being applied to said shaft and shown in theact of being ground into a similarly-shaped door-frame. Fig. 3 is a planof said door and frame, the grinding-shaft being sectioned horizontally.Fig. 4 is an enlarged section showing the devices wherewith a safe-dooris loosely coupled to a grinding-shaft.

A A A are vertical standards of my machine, and B is a driving-shaftjournaled in the standards A A, said shaft being provided with afiy-wheel I), stepped pulley b, and pinion b, and said pinion beingengaged with a spur-wheel C, secured to one end of a horizontalcounter-shaft D, having a longitudinal groove d, as more clearly shownin Fig. 2. Arranged below this counter-shaft and parallel therewith is astout cast beam E, that ties together the standards A and A, the frontof said beam being provided with a pair of longitudinal ribs or guides e6, having their upper and lower edges undercut to con- Serial No.724,125. (N0 model.)

fine to a proper path two or more sliding heads F F, the number of whichshiftablc devices will be determined by the length of the machine andthe special duty it has to perform. f f are clamp screws for retainingthese heads at any desired position along the beam E.

Journaled vertically in the slide F is a grinding shaft G, having alongitudinal 6o groove g and provided at top with a bevelwheel H, theobject of said groove being to admit a pin or feather h, projectinginwardly from said wheel II. By this arrangement the shaft is compelledto rotate in unison with said wheel, and yet is capable of being raisedand lowered when occasion requires.

J is a collar fastened around the shaft G, and j is a circumferentialgroove in said collar to admit a pin is, projecting inwardly from theforked end of a lever K, coupled to the head F in any suitable manner.As more clearly shown in Fig. 2, the grinding-shaft G has near its lowerend a transverse hole 9 to permit the ready insertion of a cross-bar L,carrying a pair of loosely-fitting circumferentially-grooved rollers ZZ; but before this bar is inserted a bridle M is applied to said shaft.This bridle has at its mid-length a circular eye 'm to fit around theshaft G, and near the opposite ends of said bridle holes m m are madefor the passage of vertical screws N N, whose lower ends engage withthreaded holes 0 0 in the outer plate of a stepped safe-door 0. (SeeFig. 2.)

P is the front of a safe, and 13 is a circular opening in the same toadmit the door 0.

Gearing with the bevel-wheel H is another bevel-wheel I, mounted uponthe countershaft D and having a hub 2', provided with a clamp-screw t",that traverses the longitudinal groove d of said shaft.

My machine is arranged for work and then operates in the followingmanner: The plate P is first laid flatly under the machine and 5 thenthe screws fft" are slackened to enable the head F to be shifted untilthe axis of its shaft G is vertically in line with the center of thecircular opening 19 of said plate, after which adjustment said screwsare tightened, so as to retain said head and the bevel-gear I in theirproper positions.

The free end of lever K is next swung up to raise the shaft G and permitthe application to it successively of the bridle M, cross-bar L, androllers Z L. The screws N N are now passed down through the holes m m ofsaid bridle, brought to bear against the grooves of said rollers, andengaged with the holes 0 0 of the door 0. The free end of lever K isfinally swung down to enable the door to enter the frame-opening 1),after which act the machine is set in motion and the shaft G turned, soas to carry the door around in the direction of the arrow shown in Fig.3, emery or other suitable abradant being freely used to cause theground joint to fit very accurately together. As the bridle M is carriedby the rollers Z Z and as the latter can have some little motionlongitudinally of the cross-bar L and also around it, and as thesupporting-screws N N occupy the grooves of said rollers, it is evidentthe door is somewhat loosely suspended from the shaft G and can have alimited play either up or down or from side to side to compensate forany slight inequalities in the steps of said door or those of the frame.The grinding continues in the same direction until the joint isfinished, and then the free end of lever K is again swung up, therebylifting the door out of the frame and enabling the application to themachine of another piece of work.

By using a sufficient number of heads two, three, or more pieces of workcan be ground simultaneously, thereby greatly expediting such tediousand laborious operations and effecting a corresponding saving in themanufacture of screw-door safes, although the machine is not limited tosuch use, but can be employed for all grinding purposes admitting of acontinuous rotation in one direction. It is evident, however, that aslight modification of the machine will enable the shafts G to impart areciprocating rotary motion to the pieces of work loosely suspended fromthem, and such a change is to be considered as within the scope of myinvention.

I claim as my invention' 1. The combination, in a multiple metalgrinder,of the beam E, having longitudinal guides c, e, the head F, adjustableon said guides, the grinding-shaft G, journaled vertically in said head,and grooved longitudinally at g, the collar J, secured to said shaft G,and grooved circumferentially at j; the lever K, jointed to said head,and having a pin 7o, engaged with this latter groove j, devices forloosely coupling a piece of work to the lower part of said shaft G, anda bevel-wheel II, having a feather 71, that traverses the groove g, inthe manner described, and for the purpose stated.

2. The combination of the grinding-shaft G; the crossbar L, appliedthereto; the circumferentially-grooved rollers Z, Z, loosely journaledupon said bar; the bridle M, carried by said rollers, and provided withan eye m, and perforations m 'm; and the screws N, N, all arranged asherein described, and operating as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES E. BLEOHSCHMIDT.

\Vitnesses:

JAMEs H. LAYMAN, EARLE R. PAssEL.

